Referenced in

The Magnificent Ambersons (1942)
Near the end of the film, an Indianapolis newspaper is shown; at its left side is the column "Stage Views by Jed Leland," featuring a picture of Joseph Cotten as Leland.

Columbo: How to Dial a Murder (1978)
(TV Episode)
The murderer is a great fan of this film, owning the sled "Rosebud" and using its name as the command for his dogs to kill. He also has the movie poster on the wall, the snow globe paperweight, as well as the large "k" emblem on his gate.

One from the Heart (1981)
There's an homage shot to this film (the camera going through a sign) (source: DVD Coppola's commentary)

Reds (1981)
The film depicts the life of Jack Reed through the eyes of Louise Bryant, much as Kane's life is seen through the eyes of Thompson and the people who he interviews. Also the romantic montage between Reed and Bryant mirrors the breakfast table montage.

Lace (1984)
(TV Mini-Series)
There is a scene where Pheobe Cates recalls the making of her first porn film. When she begins... uh... acting, the camera pans up to two crew men up on a ladder, and one of them looks at the other and holds his nose. This is a reference to the scene in citizen kane at Susan's debut as an opera singer, and they pan up to the rafters where two lighting men have the same non-verbal exchange

Red Dwarf: Me² (1988)
(TV Episode)
Rimmer's death scene homages the Rosebud/snow globe scene (Rimmer lies on the floor dying, the camera zooms in on his mouth as he says his last words "Gazpacho soup" and a dome-shaped glass desk ornament containing a model of Red Dwarf falls and smashes on the floor). Similarily, Lister is curious about the meaning of Rimmer's last words. Also when Rimmer joins Lister in the movie theatre, he asks what's on and Lister says "Orson Welles, Citizen Kane."

The Flash: Deadly Nightshade (1991)
(TV Episode)
The newspaper heiress Felicia Kane shares her surname with Charles Foster Kane. Given that she is the subject of a high profile kidnapping, she is based on Patty Hearst, whose grandfather was the inspiration for Charles Foster Kane.

Dead Again (1991)
The scene in which Mike Church (Kenneth Branagh) visits the elderly Gray Baker (Andy Garcia) in his nursing home strongly mimics the scene in Citizen Kane in which the reporter visits the elderly Jed Leland (Joseph Cotton) in his nursing home. Both old men ask their visitors repeatedly for forbidden tobacco.

Dr. Demento 20th Anniversary Collection (1991)
(Video)
From Julie Brown's "The Homecoming Queen's Got a Gun": "Oh God, this is like that movie Citizen Kane You know, where later you find out "Rosebud" was a sled"

The Simpsons: A Streetcar Named Marge (1992)
(TV Episode)
When Homer gets bored in the theatre, he tears the theatre program up and plays with it in the same way that Joseph Cotton does in Citizen Kane. The mimic and angle are also identical.

A Few Good Men (1992)
A death, a series of unanswered questions and a bitter reality exposed.

The Critic: Dr. Jay (1994)
(TV Episode)
Duke talks about changing the line "Rosebud" to "Schwing"

New Nightmare (1994)
The image of Freddy on the talk show waving his arms around with the spotlight behind him is a direct reference to the super-famous shot virtually identical to this in the news-room scene after the news-reel plays in Kane. The room is dark except for a single strong light which streams in from the window, and there is a shot of the reporter where the light is directly behind him and he displaces it as he movies his arms, just like in New Nightmare.

Frasier: The Candidate (1994)
(TV Episode)
The intertitle "Citizen Crane" refers to "Citizen Kane", Orson Welles' legendary 1941 film. It won only one Oscar, but is often perceived by many critics as the pinnacle of movie making.

Lovejoy: Breaking the Broker (1994)
(TV Episode)
When Loveoy and Tink come across the trove of cars, first Xanadu is mentioned and then Rosebud.

The Adventures of Pete & Pete: Sick Day (1994)
(TV Episode)
When young Pete is holding the snowglobe and utters the words "Sick Day" then proceeds to drop the snow globe which smashes on the ground. This is nearly identical to the first scene in Citizen Kane in which Charles Foster Kane (Welles) says "Rosebud."

Immortal Beloved (1994)
It follows the same character-study structure that Citizen Kane does.

Richard III (1995)
The scene and camera shot where Richard and Lady Anne are rather cold to eachother in the back seat of a car en route to the King's Summer House, is very like when Kane and his second wife are en route to the Everglades retreat.

SpongeBob SquarePants: BubbleStand/Ripped Pants (1999)
(TV Episode)
When Patrick points at the elephant bubble and says "It's a giraffe." This is a reference to the scene in Citizen Kane, in which Charles is making shadow puppets for Susan Alexander, and Susan mixes up an elephant and a giraffe from the shadow Charles made.

Sunshine (1999)
In the last part of the movie, the book with the recipe of the Sonnenschein-elixir is a MacGuffin like "Rosebud" in Citizen Kane. Also, the end with the book being thrown away and lost forever references the end of Citizen Kane with "Rosebud" being destroyed in the fire.

A Very Long Engagement (2004)
In the scene at the train station, Director Juenet reveals in the commentary that this shot was an homage to the scene just before the opera in Citizen Kane, when all the characters mull all over the place.

Alexander (2004)
When Alexander dies, he looses his beloved ring (a gift from Hephaistion), which falls down just like the bowl containing the snowy landscape reproduction falls off from the hands of Charles Foster Kane in "Citizen Kane" by director Orson Welles. Both ring and bowl were objects which the two protagonists were very fond of, as symbols of (secretly) crucial moments in their lifes.

Superbad (2007)
When Evan says to Seth "You're like Orson Welles", Evan compares Welles' early debut in film world to Seth's early sexual experiences. Orson Welles was 25 years old when he made his first film: "Citizen Kane".

The Screenwriter (2012)
(Short)
Poster seen on Belvedere's wall. Greg also mentions it in dialogue

The Days Inbetween (2012)
In the cinema storyline, a customer complains about a film that was "wrongly" projected in black and white. The projectionist says the film is from the 1940s, and generally considered the greatest of all time. The customer complains about the lack of action in the film, to which the Projectionist replies that he will let Orson Welles know.

Endeavour: Ride (2016)
(TV Episode)
When Morse jokingly describes Bixby's art collection as "the loot of the world", he is quoting a famous line from the "News On The March" sequence in "Citizen Kane".

The Chase Australia: Episode #2.2 (2016)
(TV Episode)
The Chaser mentions that Citizen Kane was modelled on William Randolph Hearst after his granddaughter Patty is revealed as the correct answer to a question asked when he and Lisa go head to head.

Fantastic Beasts and Where to Find Them (2016)
Henry Shaw is making a speech and has large poster of himself for president in the background is a shot by shot replication of Charles Kane making a speech and having a large poster of himself running for president

Duckman: Private Dick/Family Man: I, Duckman (1994)
(TV Episode)
While searching through the attic in finding clues to the past in why the bomber has a grudge against Duckman, he find a sled referencing the sled from the film.